CN203604300U - Screw position adjusting structure and hydraulic valve set value adjusting device - Google Patents
Screw position adjusting structure and hydraulic valve set value adjusting device Download PDFInfo
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- CN203604300U CN203604300U CN201320756954.6U CN201320756954U CN203604300U CN 203604300 U CN203604300 U CN 203604300U CN 201320756954 U CN201320756954 U CN 201320756954U CN 203604300 U CN203604300 U CN 203604300U
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- nut
- position regulation
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Abstract
The utility model discloses a screw position adjusting structure and a hydraulic valve set value adjusting device, and relates to the technical field of engineering machines. The screw position adjusting structure and the hydraulic valve set value adjusting device solve the technical problem that in the prior art, adjusting precision is poor. The screw position adjusting structure comprises an adjusting screw and a nut. The adjusting screw is provided with an outer thread matched with an inner thread of the nut. One end, in the axial direction, of the adjusting screw extends to form the nut. The portion, in the nut, of the adjusting screw is provided with a position mark, the nut is provided with an observation gap, the position mark is exposed out of the observation gap, and the part, around the observation gap, of the nut is provided with scales. The position mark is an edge ridge which is of a step structure and surrounds the circumferential outer surface of the adjusting screw. The hydraulic valve set value adjusting device comprises the screw position adjusting structure. The screw position adjusting structure is used for improving the safety performance and adjusting precision of the hydraulic valve set value adjusting device.
Description
Technical field
The utility model relates to technical field of engineering machinery, relates in particular to a kind of screw position regulation structure and the hydrovalve set point adjustment device of this screw position regulation structure is set.
Background technique
Be very complicated in the hydraulic system of modern crane tool, and hydraulic system is made up of elements such as hydrovalve, pipeline and the joints of various functions.Hoist comprises standard and special Flow valve, pressure valve and selector valve with hydrovalve.
Certainly, the setting of hydrovalve function value has vital impact to the normal operation of hydraulic system, and the realization of each function value is to realize by controlling device.Controlling device is refered in particular to the pressure of regulator solution pressure valve or the device of flow on hydrovalve at this, generally comprises screw rod, nut and spring etc.Once each function value has been demarcated, guarantee that vehicle can not occur deviation in the process using, this just requires controlling device must have reliable securing means; On the other hand, vehicle often needs the function value of each valve again to demarcate in maintenance and debug process, therefore require the controlling device of each valve to have good property easy to adjust and accuracy.
The controlling device ubiquity Security deficiency of extensive use at present, the shortcoming of property easy to adjust and low precision, this just gives vehicle in maintenance or debug process, brings very large potential safety hazard.
As shown in Figure 1, existing hoist hydrovalve set point adjustment device comprises valve body 1, spring 2, valve pocket 3, nut (this nut also claims tightening nut conventionally) 4, adjusting screw rod 5, wherein between valve pocket 3 and valve body 1, adjusting screw rod 5 and valve pocket 3 and be screw-thread fit between nut 4 and adjusting screw rod 5.In the time needing the setting value of Regulation spring 2, first unclamp nut 4, then by adjusting screw rod 5 precessions or back-out, after having set up, nut 4 is screwed.
At least there is following technical problem in prior art:
Existing hoist hydrovalve set point adjustment device can substantially be realized and regulating and fastening function, but screw rod 5 infinite place devices as shown in Figure 1, once regulate the improper setting value that causes too high, thus cause danger.In addition, this device shows without scale, cannot form fine adjustment.
Model utility content
One of them object of the present utility model is the hydrovalve set point adjustment device that proposes a kind of screw position regulation structure and this screw position regulation structure is set, and has solved prior art and has had the technical problem that regulates poor accuracy.Preferred version of the present utility model has also solved prior art poor stability, has regulated inconvenient technological deficiency.Many technique effects that the utility model optimal technical scheme can produce refer to below sets forth.
For achieving the above object, the utility model provides following technological scheme:
This screw position regulation structure, comprises adjusting screw rod and nut, wherein:
Described adjusting screw rod is provided with outside thread, and described outside thread matches with the internal thread of described nut;
Described nut is extended in wherein one end on described adjusting screw rod axial direction, and the wherein the other end on described adjusting screw rod axial direction is positioned at described nut and this end is provided with the torsional part that can drive described adjusting screw rod to rotate;
The part that described adjusting screw rod is positioned at described nut is provided with station location marker, on described nut, is provided with direct vision port, and described direct vision port exposes described station location marker, and is provided with scale on described direct vision port described nut around;
Described station location marker is around the arris of ledge structure of circumferential exterior surface that is arranged on described adjusting screw rod, or described station location marker is around the mark line of circumferential exterior surface that is arranged on described adjusting screw rod.
At one preferably or alternatively in embodiment, described torsional part is also provided with limit convex edge, on the inwall of described nut, be provided with concave station, described limit convex is along embedding in described concave station, and described limit convex is along can be along the axial direction of described adjusting screw rod movable (being preferably slip) in described concave station.
At one, preferably or alternatively in embodiment, described torsional part and described adjusting screw rod are integral type structure, and on the end face of described torsional part, are provided with at least one groove.
At one, preferably or alternatively in embodiment, the outer surface of described nut is cambered surface.
At one, preferably or alternatively in embodiment, described direct vision port runs through the wall body of whole described nut along the axial direction of described nut.
At one, preferably or alternatively in embodiment, described scale comprises at least two graduation lines and the numeral corresponding with described graduation line, and all described graduation lines and described numeral evenly distributed along the axial direction of described nut.
At one preferably or alternatively in embodiment, described ledge structure is that described adjusting screw rod arranges externally threaded part and jointly forms with described torsional part, and the arris of described ledge structure is the arris that described adjusting screw rod arranges externally threaded part.
This hydrovalve set point adjustment device, comprises the screw position regulation structure that the arbitrary technological scheme of valve body, elastic component, valve pocket, spool and the utility model provides, wherein:
Described spool is positioned at described valve body, and described spool can be movable in described valve body;
Wherein one end of described valve pocket is detachably fixedly connected with described valve body, the installation screw that is provided with sliding channel in described valve pocket and is connected with described sliding channel;
Described elastomer is positioned at described sliding channel, and described elastic component is wherein connected on described spool one end, and the wherein the other end of described elastic component and the adjusting screw rod of described screw position regulation structure connect;
The internal thread of the nut of described screw position regulation structure and the internal thread of described installation screw all match with the outside thread of described adjusting screw rod, and described nut is connected on the wherein the other end of described valve pocket.
Preferably or alternatively in embodiment, between described nut and described valve pocket and/or between described valve pocket and described valve body, be also provided with seal ring at one.
At one preferably or alternatively in embodiment, the external diameter of the part that described adjusting screw rod and described elastic component connect is less than the externally threaded large footpath on described adjusting screw rod, and the part that described adjusting screw rod and described elastic component connect is embedded in described sliding channel and can in described sliding channel, slides by the axial direction along described adjusting screw rod.
Based on technique scheme, the utility model embodiment at least can produce following technique effect:
The part that in the screw position regulation structure providing due to the utility model, adjusting screw rod is positioned at nut is provided with station location marker, on nut, be provided with direct vision port, direct vision port exposes station location marker, and be provided with scale on direct vision port nut around, so can accurately identify the variation of station location marker position by direct vision port, and then can accurately draw the variable quantity of adjusting screw rod, in the time that this screw position regulation structure is applied to hydrovalve set point adjustment device, the pressure that more accurately the spool of regulator solution pressure valve bears, there is so solved prior art the technical problem that regulates poor accuracy.
The optimal technical scheme that the utility model provides compared with prior art at least can also produce following technique effect:
1, limit convex edge can guarantee that with the terraced structure that the concave station on nut inner wall forms adjusting screw rod regulates in certain travel range, thereby is unlikely to excessive the causing danger of precession distance;
2, arranging of direct vision port and scale can be improved the precision that adjusting screw rod regulates;
3, this hydrovalve set point adjustment device has adjusting screw rod stroke measurment function, can more easily adjusting screw rod be adjusted to the position needing, thereby the pressure that adjusting screw rod is imposed on to spool by elastic component (being preferably spring) is adjusted to required force value.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
The cross-sectional schematic that Fig. 1 is the screw position regulation structure that provides in prior art;
The cross-sectional schematic of the hydrovalve set point adjustment device that Fig. 2 is the screw position regulation structure that the utility model embodiment is set provides;
Reference character: 1, valve body; 2, spring; 3, valve pocket; 4, nut; 5, adjusting screw rod; 6, station location marker; 7, torsional part; 8, limit convex edge; 9, concave station; 10, groove; 11, direct vision port; 12, scale; 13, sliding channel; 14, installation screw; 151, seal ring; 152, seal ring.
Embodiment
Can understand the distinctive points between content of the present utility model and the utility model and prior art with reference to accompanying drawing Fig. 1～Fig. 2 and word content below.Below by accompanying drawing and enumerate optional embodiments' more of the present utility model mode, the technical solution of the utility model (comprising optimal technical scheme) is described in further detail.It should be noted that: any technical characteristics in the present embodiment, any technological scheme is all one or more in technical characteristics or the optional technological scheme of plurality of optional, cannot exhaustive all alternative technical characteristicss of the present utility model and alternative technological scheme in order to describe succinct need in presents, also the mode of execution that is not easy to each technical characteristics all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: arbitrary technological means that the utility model can be provided is replaced or any two or more technological means or technical characteristics that the utility model is provided combine mutually and obtain new technological scheme.Any technical characteristics in the present embodiment and any technological scheme all do not limit protection domain of the present utility model, protection domain of the present utility model should comprise those skilled in the art do not pay creative work thinkable any alternate embodiments and those skilled in the art any two or more technological means that the utility model is provided or technical characteristics combine mutually and the new technological scheme that obtains.
The utility model embodiment provides that a kind of position regulation precision of adjusting screw rod is higher, more preferably screw position regulation structure and the hydrovalve set point adjustment device of this screw position regulation structure is set of Security.
Technological scheme the utility model being provided below in conjunction with Fig. 1～Fig. 2 is carried out more detailed elaboration.
As shown in Fig. 1～Fig. 2, the screw position regulation structure that the utility model embodiment provides comprises adjusting screw rod 5 and nut 4, wherein: the outer surface of nut 4 is preferably cambered surface.
Adjusting screw rod 5 is provided with outside thread, and outside thread matches with the internal thread of nut 4.
The part that adjusting screw rod 5 is positioned at nut 4 is provided with station location marker 6, is provided with direct vision port 11 on nut 4, and direct vision port 11 exposes station location marker 6, and is provided with scale 12 on direct vision port 11 nut 4 around.
Station location marker 6 is the arris of ledge structure of circumferential exterior surface around being arranged on adjusting screw rod 5, or station location marker 6 is the mark line of circumferential exterior surface around being arranged on adjusting screw rod 5.
The part that in the screw position regulation structure providing due to the utility model, adjusting screw rod 5 is positioned at nut 4 is provided with station location marker 6, on nut 4, be provided with direct vision port 11, direct vision port 11 exposes station location marker 6, and be provided with scale 12 on direct vision port 11 nut 4 around, so can accurately identify the variation of station location marker 6 positions by direct vision port 11, and then can accurately draw the variable quantity of adjusting screw rod 5, in the time that this screw position regulation structure is applied to hydrovalve set point adjustment device, the pressure that more accurately the spool of regulator solution pressure valve bears.
As preferably or alternatively mode of execution of one, torsional part 7 is also provided with limit convex along 8, is provided with concave station 9 on the inwall of nut 4, and limit convex is along in 8 embedding concave stations 9, and limit convex can be along the axial direction of adjusting screw rod 5 in the interior slip of concave station 9 along 8.
Limit convex along 8 with nut 4 inwalls on the terraced structure that forms of concave station 9 can guarantee that adjusting screw rod 5 regulates in certain travel range, thereby be unlikely to excessive the causing danger of precession distance.
As preferably or alternatively mode of execution of one, torsional part 7 is integral type structure with adjusting screw rod 5, and on the end face of torsional part 7, is provided with at least one (being preferably one) groove 10.Use screw-driver to be inserted in the interior torsional part 7 that can rotate of groove 10 to drive adjusting screw rod 5 to rotate, and then change the stroke of adjusting screw rod 5 along its axial direction.
As preferably or alternatively mode of execution of one, direct vision port 11 runs through the wall body of whole nut 4 along the axial direction of nut 4.Can see station location marker 6 by direct vision port 11, and then observe the distance of adjusting screw rod 5 along the movement of its axial direction by the position of station location marker 6.
As preferably or alternatively mode of execution of one, scale 12 comprises at least two graduation lines and the numeral corresponding with graduation line, and all graduation lines and numeral evenly distributed along the axial direction of nut 4.Be convenient to read and log location identification 6 and the residing position of adjusting screw rod 5 according to numeral.
As preferably or alternatively mode of execution of one, ledge structure is that adjusting screw rod 5 arranges externally threaded part and jointly forms with torsional part 7, and the arris of ledge structure is the arris that adjusting screw rod 5 arranges externally threaded part.Ledge structure simple in structure, is convenient to manufacturing.
The hydrovalve set point adjustment device that the utility model provides, comprise the screw position regulation structure that valve body 1, elastic component (being preferably spring 2), valve pocket 3, spool and the arbitrary technological scheme of the utility model provide, wherein: spool is positioned at valve body 1, and spool can be in the interior activity of valve body 1.
Wherein one end of valve pocket 3 is detachably fixedly connected with valve body 1, the installation screw 14 that is provided with sliding channel 13 in valve pocket 3 and is connected with sliding channel 13.
Elastomer is positioned at sliding channel 13, and elastic component (being preferably spring 2) is wherein connected on spool one end, and the wherein the other end of elastic component (being preferably spring 2) and the adjusting screw rod 5 of screw position regulation structure connect.
The internal thread of the nut 4 of screw position regulation structure and the internal thread of installation screw 14 all match with the outside thread of adjusting screw rod 5, and nut 4 is connected on the wherein the other end of valve pocket 3.
When nut 4 is connected on valve pocket 3, the locking position of adjusting screw rod 5 can be lived, avoid its in axial direction vibration.
The screw position regulation structure that this practicality newly provides is preferably on the hydrovalve that is applied to hoist.Certainly the screw position regulation structure that, the arbitrary technological scheme of the utility model provides also can be applied on other mechanical devices outside air pressure valve or the hoist of hoist.
As preferably or alternatively mode of execution of one, between nut 4 and valve pocket 3 and/or between valve pocket 3 and valve body 1, be also provided with seal ring.Between nut 4 and valve pocket 3, be provided with seal ring 151, between valve pocket 3 and valve body 1, be provided with seal ring 152.Seal ring 151 not only can be avoided the oil liquid leakage in valve body 1, and the extruding force that nut 4 imposes on valve pocket 3 is also had to buffer function.The effect of the effect of seal ring 152 and seal ring 151 is similar.
As preferably or alternatively mode of execution of one, adjusting screw rod 5 is less than the externally threaded large footpath on adjusting screw rod 5 with its external diameter of part that elastic component (being preferably spring 2) connects, and it is embedded in sliding channel 13 and can slides at the interior axial direction along adjusting screw rod 5 of sliding channel 13.
In this structure, the internal diameter of sliding channel 13 can be designed as less size, so can effectively avoid oil liquid leakage, and also adjusting screw rod 5 is in the interior slip of sliding channel 13, is conducive to adjusting screw rod 5 elastic component (being preferably spring 2) is applied to extruding force.
Above-mentioned arbitrary technological scheme disclosed in the utility model unless otherwise stated, if it discloses number range, so disclosed number range is preferred number range, any it should be appreciated by those skilled in the art: preferred number range is only the obvious or representative numerical value of technique effect in many enforceable numerical value.Because numerical value is more, cannot be exhaustive, so the utility model just discloses part numerical value to illustrate the technical solution of the utility model, and the above-mentioned numerical value of enumerating should not form the restriction of the utility model being created to protection domain.
If used the word such as " first ", " second " to limit component herein, those skilled in the art should know: the use of " first ", " second " is only used to be convenient to describe above component are distinguished as not having outside Stated otherwise, and above-mentioned word does not have special implication.
Simultaneously, if above-mentioned the utility model discloses or has related to component or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can dismantle and be fixedly connected with (for example using bolt or screw to connect), also can be understood as: non-removable being fixedly connected with (for example rivet, weld), certainly, connection fastened to each other also can for example, be replaced (obviously cannot adopt except integrally formed technique) by integral type structure (use casting technique is integrally formed to be created).
In addition, in the disclosed arbitrary technological scheme of above-mentioned the utility model applied for the term that represents position relationship or shape unless otherwise stated its implication comprise and its approximate, similar or approaching state or shape.Arbitrary parts that the utility model provides can be both to be assembled by multiple independent constituent elements, the produced separate part of the technique that also can be one of the forming.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characteristics is equal to replacement embodiment of the present utility model; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technological scheme scope of the utility model request protection.
Claims (10)
1. a screw position regulation structure, is characterized in that, comprises adjusting screw rod and nut, wherein:
Described adjusting screw rod is provided with outside thread, and described outside thread matches with the internal thread of described nut;
Described nut is extended in wherein one end on described adjusting screw rod axial direction, and the wherein the other end on described adjusting screw rod axial direction is positioned at described nut and this end is provided with the torsional part that can drive described adjusting screw rod to rotate;
The part that described adjusting screw rod is positioned at described nut is provided with station location marker, on described nut, is provided with direct vision port, and described direct vision port exposes described station location marker, and is provided with scale on described direct vision port described nut around;
Described station location marker is around the arris of ledge structure of circumferential exterior surface that is arranged on described adjusting screw rod, or described station location marker is around the mark line of circumferential exterior surface that is arranged on described adjusting screw rod.
2. screw position regulation structure according to claim 1, it is characterized in that, described torsional part is also provided with limit convex edge, on the inwall of described nut, be provided with concave station, described limit convex is along embedding in described concave station, and described limit convex is along can be movable in described concave station along the axial direction of described adjusting screw rod.
3. screw position regulation structure according to claim 1, is characterized in that, described torsional part and described adjusting screw rod are integral type structure, and on the end face of described torsional part, is provided with at least one groove.
4. screw position regulation structure according to claim 1, is characterized in that, the outer surface of described nut is cambered surface.
5. screw position regulation structure according to claim 1, is characterized in that, described direct vision port runs through the wall body of whole described nut along the axial direction of described nut.
6. screw position regulation structure according to claim 1, it is characterized in that, described scale comprises at least two graduation lines and the numeral corresponding with described graduation line, and all described graduation lines and described numeral evenly distributed along the axial direction of described nut.
7. according to the arbitrary described screw position regulation structure of claim 1-6, it is characterized in that, described ledge structure is that described adjusting screw rod arranges externally threaded part and jointly forms with described torsional part, and the arris of described ledge structure is the arris that described adjusting screw rod arranges externally threaded part.
8. a hydrovalve set point adjustment device, is characterized in that, comprises the arbitrary described screw position regulation structure of valve body, elastic component, valve pocket, spool and claim 1-7, wherein:
Described spool is positioned at described valve body, and described spool can be movable in described valve body;
Wherein one end of described valve pocket is detachably fixedly connected with described valve body, the installation screw that is provided with sliding channel in described valve pocket and is connected with described sliding channel;
Described elastomer is positioned at described sliding channel, and described elastic component is wherein connected on described spool one end, and the wherein the other end of described elastic component and the adjusting screw rod of described screw position regulation structure connect;
The internal thread of the nut of described screw position regulation structure and the internal thread of described installation screw all match with the outside thread of described adjusting screw rod, and described nut is connected on the wherein the other end of described valve pocket.
9. hydrovalve set point adjustment device according to claim 8, is characterized in that, between described nut and described valve pocket and/or between described valve pocket and described valve body, is also provided with seal ring.
10. hydrovalve set point adjustment device according to claim 8 or claim 9, it is characterized in that, the external diameter of the part that described adjusting screw rod and described elastic component connect is less than the externally threaded large footpath on described adjusting screw rod, and the part that described adjusting screw rod and described elastic component connect is embedded in described sliding channel and can in described sliding channel, slides by the axial direction along described adjusting screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320756954.6U CN203604300U (en) | 2013-11-26 | 2013-11-26 | Screw position adjusting structure and hydraulic valve set value adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320756954.6U CN203604300U (en) | 2013-11-26 | 2013-11-26 | Screw position adjusting structure and hydraulic valve set value adjusting device |
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| CN203604300U true CN203604300U (en) | 2014-05-21 |
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| CN201320756954.6U Expired - Fee Related CN203604300U (en) | 2013-11-26 | 2013-11-26 | Screw position adjusting structure and hydraulic valve set value adjusting device |
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| CN105972001A (en) * | 2016-06-30 | 2016-09-28 | 江苏金荣森制冷科技有限公司 | Industrial refrigeration device for hydraulic bypass with adjustable pressure relief valve |
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| CN106122174A (en) * | 2016-06-30 | 2016-11-16 | 江苏金荣森制冷科技有限公司 | The method of work of the temperature control hydraulic pressure heat-exchanger rig with the bypass of adjustable relief valve hydraulic pressure |
| CN106050776A (en) * | 2016-06-30 | 2016-10-26 | 江苏金荣森制冷科技有限公司 | Hydraulic bypass with adjustable piston type bidirectional pressure relief valve |
| CN105972001A (en) * | 2016-06-30 | 2016-09-28 | 江苏金荣森制冷科技有限公司 | Industrial refrigeration device for hydraulic bypass with adjustable pressure relief valve |
| CN106015192A (en) * | 2016-06-30 | 2016-10-12 | 江苏金荣森制冷科技有限公司 | Work method for hydraulic heat exchange system of hydraulic bypass with adjustable pressure release valve |
| CN105937520A (en) * | 2016-06-30 | 2016-09-14 | 江苏金荣森制冷科技有限公司 | Temperature control hydraulic heat exchange device with adjustable pressure relief valve hydraulic bypass |
| CN106015197A (en) * | 2016-06-30 | 2016-10-12 | 江苏金荣森制冷科技有限公司 | Temperature control industrial refrigerating machine with adjustable type pressure release valve hydraulic bypass |
| CN105972003A (en) * | 2016-06-30 | 2016-09-28 | 江苏金荣森制冷科技有限公司 | Working method for industrial refrigerator for hydraulic bypass with adjustable pressure release valve |
| CN106123411A (en) * | 2016-06-30 | 2016-11-16 | 江苏金荣森制冷科技有限公司 | The method of work of the industrial refrigerating plant of the hydraulic pressure bypass with adjustable relief valve |
| CN106015193A (en) * | 2016-06-30 | 2016-10-12 | 江苏金荣森制冷科技有限公司 | Temperature-control hydraulic heat exchange system of hydraulic bypass with adjustable pressure release valve |
| CN106151180A (en) * | 2016-06-30 | 2016-11-23 | 江苏金荣森制冷科技有限公司 | The method of work of the temperature control industrial refrigerating plant with the bypass of adjustable relief valve hydraulic pressure |
| CN105972001B (en) * | 2016-06-30 | 2017-10-27 | 江苏金荣森制冷科技有限公司 | The industrial refrigerating plant of hydraulic pressure bypass with adjustable relief valve |
| CN106050776B (en) * | 2016-06-30 | 2017-11-07 | 江苏金荣森制冷科技有限公司 | Hydraulic pressure bypass with adjusting flexible plunger type bidirection press relief valve |
| CN105972003B (en) * | 2016-06-30 | 2017-12-05 | 江苏金荣森制冷科技有限公司 | The method of work of the industrial refrigeration machine of hydraulic pressure bypass with adjustable relief valve |
| CN106123411B (en) * | 2016-06-30 | 2019-03-26 | 江苏金荣森制冷科技有限公司 | The working method of the industrial refrigerating plant of hydraulic pressure bypass with adjustable relief valve |
| CN107559254A (en) * | 2017-08-21 | 2018-01-09 | 泸州精通流体液压机械有限公司 | Pass through electronically controlled electric proportional control valve |
| CN107559255A (en) * | 2017-08-21 | 2018-01-09 | 泸州精通流体液压机械有限公司 | Electric proportional control valve based on electric-control system |
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